slime/slime — pull request #167 by 3b (2014-06-29 23:20:43+00:00)
Title: Add hooks for extending arglist lookup.

Useful for example in [slime proxy](https://github.com/3b/slime-proxy), which wants to show arglists for parenscript functions/macros in addition to or instead of those defined in the host lisp.